Cissus discolor aka Climbing Begonia

Cissus discolor is a tender vine in the grape family. Its common name, rex begonia vine, refers to its leaves. It is not a begonia. Sources also list it as Cissus javana. Its native range runs from south-central China through tropical Asia. It grows in wet tropical areas, climbing trees and shrubs. Forked tendrils grip supports, while unsupported stems trail over the ground.

This evergreen climber has thin red stems and rich leaf colour. Garden plants reach about 5–10 feet [1.5–3.05 metres] in length. Their spread is about 0.3–1.6 feet [0.1–0.5 metres]. Long, heart-shaped leaves have dark green upper surfaces. Silver or pink patches lie between the veins. The leaf undersides are deep purple to purple-red. Leaves can reach 0.5 feet [0.15 metres] long. Small flowers grow in branched clusters beside the leaves. Chicago Botanic Garden lists green or yellow blooms from March through June. The flowers attract little attention and may rarely appear. Round berries turn purple to black.

Give this vine bright light without harsh, direct sun. Too much shade weakens the leaf pattern. Strong sun can scorch the leaves and leave brown patches. Warm air and high humidity suit it best. Use rich, loam-based soil that holds moisture but drains well. Keep the soil evenly moist during active growth. Reduce watering in winter, but do not treat it as drought-tolerant. RHS advises monthly high-nitrogen feeding during the growing season. Long spells at 50°F [10°C] or below impair growth.

The vine suits a trellis, hanging basket, or container edge. It also works in mixed borders where warmth allows. In cold climates, grow it as an annual or houseplant. Bring outdoor plants inside to a bright spot as temperatures fall. Missouri Botanical Garden gives USDA zones 11–12; Chicago gives 10–13. RHS rates it H1B, allowing summer outdoor use in Britain. Trim shoots that grow too long. Semi-ripe cuttings offer a way to make more plants.

Watch for spider mites, mealybugs, and whiteflies. RHS reports few disease problems. Dry air can cause brown leaf patches. Low winter light may make older leaves fall. Useful Tropical Plants reports edible leaves and young shoots. People eat them raw or cooked for their sour taste. It also records folk uses for stomach pain and itchy skin. These reports do not establish medical benefit. The source lists no known hazards, but does not establish pet safety.